将新兴的发电技术（风力发电、燃料电池发电）及新型储能技术（制氢储能、超导储能装置）引入传统的电力变电站，提出了不间断电力变电站的概念，使变电站的功率输出平滑、稳定、不中断。从分布式电源的通用接口模型出发，介绍了不间断电力变电站的模型，分析了其功率协调的机理。介绍了多代理技术的概念、代理的层次结构和代理间的交互策略，基于此构建了不间断电力变电站多代理协调控制系统，并展望了今后研究工作的方向。

In this paper, a fault current limiter (FCL) with series compensation is proposed. It is composed of a limiting reactor and a compensation capacitor that is parallel with a by-pass reactor controlled by GTO. The FCL can not only control fault current, but also perform series compensation. The good performance of this device is proved by simulation, it will be a practical protection device for power systems in the future.

Abstract A novel nonlinear emergency control method for HVDC transmission systems is presented in this paper. First, an observation decoupled state space model of AC and DC interconnected power systems, which allows estimation or computation of the state components from local measurements, is developed. Secondly, the nonlinear control rules of HVDC links are derived using optimal-variable-aim strategy (OVAS), which not only improves the first swing stability, but also effectively damps the subsequent power oscillation. Finally, the simulation results of a three-machine six-bus system show that the proposed method can enough use the capabilities of fast response and short-time overload of HVDC links to improve the transient stability of power systems.

ABSTRACT Two static equivalent methods are used to acquire equivalent parameter of power systems in this paper. These two methods combine feature and requirement of power systems and use the base-case system information and Thevenin equivalent theory for analyzing the voltage stability problem. The Q-V, P-V, P-Q curves and the minimum singular value, which has distinctive physical meaning and requires less computation work compared with the margin methods expressed by previous singular value, can be quickly got by these two methods respectively.

The Voltage/Var optimization power flow is calculated by the method of SQP (successive quadratic programming method), with regarding the minimum of transmission line losses as the objective functions, the reactive power flow equations as equality constrains and a set of voltage and control variables as inequality constrains. Deciding objective functions and constrains equations, the angle of voltage is not considered as constant but active power of transmission lines was considered as constant. In this paper, formulas of objective function, equality constrains and inequality constrains were deduced by constant active power. The demand on selecting initial values of iteration of this method is not strict. The results of reactive power optimization of Ward & Hale 6, IEEE 14 and IEEE30 bus systems show that this method had stable convergence.